Comment on ``Anisotropic s-wave superconductivity: comparison with experiments on MgB2 [A. I. Posazhennikova, T. Dahm and K. Maki, cond-mat/0204272; submitted to Europhys. Lett.]
Abstract
An analytical result for the renormalization of the jump of the heat capacity Delta C/CN by the anisotropy of the order parameter is derived within the framework of the very recent model proposed by Posazhennikova, Dahm and Maki [cond-mat/0204272, submitted to Europhys. Lett.], for both oblate and prolate anisotropy. The graph of Delta C/CN versus the ratio of the gaps on the equator and the pole of the Fermi surface, Deltae/Δp, allows a direct determination of the gap anisotropy parameter Deltae/Δp by fitting data from specific heat measurements Delta C/CN. Using the experimental value Delta C/CN=0.82 +/- 10% by Wang, Plackowski, and Junod [Physica C 355 (2001) 179] we find Deltae/Δp = 4.0.
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